641512423252631 has 4 divisors (see below), whose sum is σ = 733157055145872. Its totient is φ = 549867791359392.

The previous prime is 641512423252609. The next prime is 641512423252661. The reversal of 641512423252631 is 136252324215146.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641512423252631 is a prime.

It is a super-2 number, since 2×641512423252631² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641512423252661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45822315946610 + ... + 45822315946623.

It is an arithmetic number, because the mean of its divisors is an integer number (183289263786468).

Almost surely, 2^{641512423252631} is an apocalyptic number.

641512423252631 is a deficient number, since it is larger than the sum of its proper divisors (91644631893241).

641512423252631 is an equidigital number, since it uses as much as digits as its factorization.

641512423252631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91644631893240.

The product of its digits is 2073600, while the sum is 47.

Adding to 641512423252631 its reverse (136252324215146), we get a palindrome (777764747467777).

The spelling of 641512423252631 in words is "six hundred forty-one trillion, five hundred twelve billion, four hundred twenty-three million, two hundred fifty-two thousand, six hundred thirty-one".